Patriots tight end Rob Gronkowski is carted off the field after injuring his knee in a December game against the Browns.

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NFL players worry about head injuries and their potential long-term consequences but not nearly as much as they worry about injuries to their legs, particularly their knees, that can end careers.

USA Today Sports surveyed 293 players on 20 NFL teams and asked what body part they were most concerned about injuring in a game: 46 percent said knees or other parts of their legs, 24 percent said head and neck and 26 percent said none.

The poll of players on active rosters was conducted from mid-December to early January and has a margin of error of plus or minus 5 percent. If requested, players were ...